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Simple question: I am unable to use the looted runestones (those that I have found during my exploration) in crafting - thus it's impossible to get them upgraded into the greater ones.

Bug or not?
This question / problem has been solved by From_Dutchimage
And you have purchased/found the recipe to craft the greater runestones, right? Just making sure :)
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szotu: Simple question: I am unable to use the looted runestones (those that I have found during my exploration) in crafting - thus it's impossible to get them upgraded into the greater ones.

Bug or not?
It's a bug and fix coming.
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GrayBlondie: And you have purchased/found the recipe to craft the greater runestones, right? Just making sure :)
Indeed :)
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gunsynd: It's a bug and fix coming.
Alright, glad to read this. For a second I just thought that only I have this problem.
For the time being you can only upgrade the runes you purchase or make. The looted ones cannot be upgraded.
Until we get a fix, you can try 'switching' runestones at the alchemist in the church east of novigrad. You can sell yours and buy his at the same price (he is not a very good merchant). Just be careful not to buy back your own runes because they still won't work.